package com.example.bluetooth_test;

import java.util.Set;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

public class DeviceListActivity extends Activity {
	private static final String TAG = "DeviceActivity";

	public static String EXTRA_DEVICE_ADDRESS = "device_address";

	private BluetoothAdapter mBluetoothAdapter;
	private ArrayAdapter<String> mPairedDevicesArrayAdapter;
	private ArrayAdapter<String> mNewDevicesArrayAdapter;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		Log.e(TAG, "== onCreate() ==");

		// Setup the window
		requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
		setContentView(R.layout.activity_device_list);

		// Set result CANCELED in case the user backs out
		setResult(Activity.RESULT_CANCELED);

		// Initialize the button to perform device discovery
		Button scanButton = (Button) findViewById(R.id.button_scan);
		scanButton.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				// TODO Auto-generated method stub
				doDiscovery();
				v.setVisibility(View.GONE);
			}
		});

		// Initialize array adapters. One for already paired devices and one for
		// newly discovered devices
		mPairedDevicesArrayAdapter = new ArrayAdapter<String>(this,
				R.layout.activity_device_name);
		mNewDevicesArrayAdapter = new ArrayAdapter<String>(this,
				R.layout.activity_device_name);
		ListView pairedListView = (ListView) findViewById(R.id.paired_devices);
		pairedListView.setAdapter(mPairedDevicesArrayAdapter);
		pairedListView.setOnItemClickListener(mDeviceClickListener);

		ListView newDevicesListView = (ListView) findViewById(R.id.new_devices);
		newDevicesListView.setAdapter(mNewDevicesArrayAdapter);
		newDevicesListView.setOnItemClickListener(mDeviceClickListener);

		IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
		this.registerReceiver(mReceiver, filter);

		filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
		this.registerReceiver(mReceiver, filter);

		mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

		Set<BluetoothDevice> pairedDevices = mBluetoothAdapter
				.getBondedDevices();

		if (pairedDevices.size() > 0) {
			findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE);
			for (BluetoothDevice device : pairedDevices) {
				mPairedDevicesArrayAdapter.add(device.getName() + "\n"
						+ device.getAddress());
			}
		} else {
			String noDevices = getResources().getText(R.string.none_paired)
					.toString();
			mPairedDevicesArrayAdapter.add(noDevices);
		}
	}

	@Override
	protected void onDestroy() {
		// TODO Auto-generated method stub
		super.onDestroy();
		Log.e(TAG, "== onDestroy() ==");
		if (mBluetoothAdapter != null) {
			mBluetoothAdapter.cancelDiscovery();
		}

		this.unregisterReceiver(mReceiver);

	}

	private void doDiscovery() {
		// TODO Auto-generated method stub
		Log.e(TAG, "** doDiscovery() **");

		setProgressBarIndeterminateVisibility(true);
		setTitle(R.string.scanning);

		findViewById(R.id.title_new_devices).setVisibility(View.VISIBLE);

		if (mBluetoothAdapter.isDiscovering()) {
			mBluetoothAdapter.cancelDiscovery();
		}

		mBluetoothAdapter.startDiscovery();
	}

	private OnItemClickListener mDeviceClickListener = new OnItemClickListener() {
		public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) {
			// Cancel discovery because it's costly and we're about to connect
			mBluetoothAdapter.cancelDiscovery();

			// Get the device MAC address, which is the last 17 chars in the
			// View
			String info = ((TextView) v).getText().toString();
			String address = info.substring(info.length() - 17);

			// Create the result Intent and include the MAC address
			Intent intent = new Intent();
			intent.putExtra(EXTRA_DEVICE_ADDRESS, address);

			// Set result and finish this Activity
			setResult(Activity.RESULT_OK, intent);
			finish();
		}
	};

	private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
		public void onReceive(Context context, Intent intent) {
			String action = intent.getAction();

			// When discovery finds a device
			if (BluetoothDevice.ACTION_FOUND.equals(action)) {
				// Get the BluetoothDevice object from the Intent
				BluetoothDevice device = intent
						.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
				// If it's already paired, skip it, because it's been listed
				// already
				if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
					mNewDevicesArrayAdapter.add(device.getName() + "\n"
							+ device.getAddress());
				}
				// When discovery is finished, change the Activity title
			} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED
					.equals(action)) {
				setProgressBarIndeterminateVisibility(false);
				setTitle(R.string.select_device);
				if (mNewDevicesArrayAdapter.getCount() == 0) {
					String noDevices = getResources().getText(
							R.string.none_found).toString();
					mNewDevicesArrayAdapter.add(noDevices);
				}
			}
		}
	};
}